MB_MODE_INFO Struct Reference

Stores the prediction/txfm mode of the current coding block. More...

#include <blockd.h>

Data Fields
General Info of the Coding Block
BLOCK_SIZE	bsize
	The block size of the current coding block.
PARTITION_TYPE	partition
	The partition type of the current coding block.
PREDICTION_MODE	mode
	The prediction mode used.
UV_PREDICTION_MODE	uv_mode
	The UV mode when intra is used.
int	current_qindex
	The q index for the current coding block.
Inter Mode Info
int_mv	mv [2]
	The motion vectors used by the current inter mode.
MV_REFERENCE_FRAME	ref_frame [2]
	The reference frames for the MV.
int_interpfilters	interp_filters
	Filter used in subpel interpolation.
MOTION_MODE	motion_mode
	The motion mode used by the inter prediction.
uint8_t	num_proj_ref
	Number of samples used by warp causal.
uint8_t	overlappable_neighbors
	The number of overlapped neighbors above/left for obmc/warp motion mode.
WarpedMotionParams	wm_params
	The parameters used in warp motion mode.
INTERINTRA_MODE	interintra_mode
	The type of intra mode used by inter-intra.
int8_t	interintra_wedge_index
	The type of wedge used in interintra mode.
INTERINTER_COMPOUND_DATA	interinter_comp
	Struct that stores the data used in interinter compound mode.
Intra Mode Info
int8_t	angle_delta [PLANE_TYPES]
	Directional mode delta: the angle is base angle + (angle_delta * step).
FILTER_INTRA_MODE_INFO	filter_intra_mode_info
	The type of filter intra mode used (if applicable).
int8_t	cfl_alpha_signs
	Chroma from Luma: Joint sign of alpha Cb and alpha Cr.
uint8_t	cfl_alpha_idx
	Chroma from Luma: Index of the alpha Cb and alpha Cr combination.
PALETTE_MODE_INFO	palette_mode_info
	Stores the size and colors of palette mode.
Transform Info
uint8_t	skip_txfm
	Whether to skip transforming and sending.
TX_SIZE	tx_size
	Transform size when fixed size txfm is used (e.g. intra modes).
TX_SIZE	inter_tx_size [INTER_TX_SIZE_BUF_LEN]
	Transform size when recursive txfm tree is on.
Loop Filter Info
int8_t	delta_lf_from_base
int8_t	delta_lf [FRAME_LF_COUNT]
Bitfield for Memory Reduction
uint8_t	segment_id: 3
	The segment id.
uint8_t	seg_id_predicted: 1
	Only valid when temporal update if off.
uint8_t	ref_mv_idx: 2
	Which ref_mv to use.
uint8_t	skip_mode: 1
	Inter skip mode.
uint8_t	use_intrabc: 1
	Whether intrabc is used.
uint8_t	comp_group_idx: 1
	Indicates if masked compound is used(1) or not (0).
uint8_t	compound_idx: 1
	Indicates whether dist_wtd_comp(0) is used or not (0).
uint8_t	use_wedge_interintra: 1
	Whether to use interintra wedge.
int8_t	cdef_strength: 4
	CDEF strength per BLOCK_64X64.

Detailed Description

Stores the prediction/txfm mode of the current coding block.

Field Documentation

delta_lf_from_base

int8_t MB_MODE_INFO::delta_lf_from_base

Since actual frame level loop filtering level value is not available at the beginning of the tile (only available during actual filtering) at encoder side.we record the delta_lf (against the frame level loop filtering level) and code the delta between previous superblock's delta lf and current delta lf. It is equivalent to the delta between previous superblock's actual lf and current lf.

Referenced by encode_b(), and setup_delta_q().

delta_lf

int8_t MB_MODE_INFO::delta_lf[FRAME_LF_COUNT]

We have four frame filter levels for different plane and direction. So, to support the per superblock update, we need to add a few more params:

1. delta loop filter level for y plane vertical
2. delta loop filter level for y plane horizontal
3. delta loop filter level for u plane
4. delta loop filter level for v plane To make it consistent with the reference to each filter level in segment, we need to -1, since

• SEG_LVL_ALT_LF_Y_V = 1;
• SEG_LVL_ALT_LF_Y_H = 2;
• SEG_LVL_ALT_LF_U = 3;
• SEG_LVL_ALT_LF_V = 4;

Referenced by encode_b(), and setup_delta_q().

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The documentation for this struct was generated from the following file:

• av1/common/blockd.h